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快速、准确、实用的负序基波电流检测方法对于电能质量监测与控制、继电保护等具有极其重要的意义。通过对幅值积分信号所具有的选频特性进行分析,研究了一种负序基波提取器,在此基础上提出了一种新型的负序基波电流检测方法。基于负序基波提取器的检测方法既不需要锁相环、低通滤波器,也不需要进行αβ坐标系变换到dq坐标系及其反变换的计算。仿真与实验结果均证明了采用该检测方法的有源滤波器具有良好的补偿性能。
The fast, accurate and practical negative sequence fundamental current detection method is extremely important for power quality monitoring and control, relay protection and so on. By analyzing the frequency-selective characteristic of the amplitude-integrated signal, a negative-sequence fundamental wave extractor is studied, and a new type of negative-sequence fundamental current detection method is proposed. The detection method based on the negative sequence fundamental wave extractor neither needs the phase-locked loop, the low-pass filter, nor does it need to transform the αβ coordinate system into the dq coordinate system and its inverse transform calculation. Simulation and experimental results show that the active filter with this method has good compensation performance.